In different cases in industry such as bearings, rollers and wheel/rail, there are different criteria for predicting the life of the components, being worn. One criterion for determining wear amount in wheel and rail is based on frictional work, to which the removed material is proportional in the contact patch, and is available as an output in ADAMS/RAIL© software. In this paper, an approach is introduced to determine the function which converts wear number to wear rate. So after simulation of a line, either before or after construction, the wear rate can be obtained from the wear number which was obtained form simulation. Therefore, it will be possible to discover whether the wear condition will be satisfactory or not for a line which is not constructed yet. To test the second line of Tehran subway was selected and fleet and track of that line was modeled in ADAMS/RAIL©.

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